5.2
The boiler is designed to operate on fully pumped, pressurised sealed systems operating at
a maximum of 3bar pressure and maximum design
fl
ow temperature of 85°C.
5.3
The boiler’s integral expansion vessel is pre-charged to a pressure of 0.5 bar and will
accommodate a system volume of 125l at an average water temperature of 75°C and maximum
system pressure of 3 bar. If the system volume is more than 125 l an additional expansion
vessel must be
fi
tted to suit the size of the system. A typical installation of an additional
pressure vessel is shown below in
fi
gure 2 below.
NOTE:
The
fi
lter valve must be
fi
tted to the boiler return at the right of the boiler.
5.4
The heating circuit should be designed and balanced to give a 20°C temperature rise across
the boiler
fl
ow and return.
5.5
When
fi
tting a new boiler to an existing system the system must be thoroughly
fl
ushed in
accordance with the recommendations of BS7593:2006 prior to installation.
NOTE:
Also that the gas supply pipe to the boiler from the meter should be in 22 mm copper.
5.6
It is recommended that the system should be protected by a proprietry anticorrosion
inhibitor.
5.7
On installation it is important to ensure that the heat exchanger is not a natural collecting
point for air and where possible, the system pipe work should have a gradient to ensure any
excess air is carried naturally to other purpose made, air release points.
5.8
The system’s water must always be allowed to circulate whenever the circulation pump is
running. An automatic by-pass must be provided.
NOTE :
It is no longer permissible to use non-thermostatic radiator valves to allow by-pass
through a radiator.
8
Figure 2
Summary of Contents for SARGON 18S
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